a/c generator

Discussion in 'General Electronics Chat' started by samjesse, Apr 26, 2013.

  1. samjesse

    Thread Starter Active Member

    Sep 14, 2008
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    Hi

    Is there a portable a/c generator for home/business which automatically controls its output based on consumption demands?
    maybe speeds up as demand go up.

    thx
     
  2. Brownout

    Well-Known Member

    Jan 10, 2012
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    Look at the Honda line of portable generators. They have an economy mode, which does exactly what you asked. I own one, and it works great. One caveat, it won't put out maximum power in economy mode. You have to switch it to normal mode. I have plans to modify it to switch automatically.
     
  3. samjesse

    Thread Starter Active Member

    Sep 14, 2008
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    Honda Eco-Throttle, which automatically adjusts the engine speed to match the power needed.This is probably what I am looking for, I hope to find one which runs on LPG. Will keep looking. thank you
     
  4. crutschow

    Expert

    Mar 14, 2008
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    Varying the speed to adapt to the load only works for an inverter type generator, which the Honda is. A standard AC generator requires a constant speed to maintain a constant output frequency.
     
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  5. samjesse

    Thread Starter Active Member

    Sep 14, 2008
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    OK. so there maybe an AC generator which controls the output watt (maybe via controlling the strength of the stator magnets) instead of speed. if all are permanent magnet, then maybe modifying an electromagnetic alternator (automotive) and adapt it to work could be a solution.
     
  6. Brownout

    Well-Known Member

    Jan 10, 2012
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    No, what he's saying is that the output waveform is generated electronically. The generator actually outputs a DC voltage, which is converted to the 60 Hz AC by an electronic inverter. The Honda is so configured. That's how it is able to have the economy setting.
     
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  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    The Honda method is also used in "direct drive" wind turbines. That is, wind turbines that do not have a gear box. These wind turbines are generally more efficient because they can run at any speed proportional to wind speed instead of being governed down to increments to match an available gear ratio. Less maintenance and fewer moving parts on the direct drive model.
     
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  8. crutschow

    Expert

    Mar 14, 2008
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    A standard AC motor-generator simply has a governor that adjusts the throttle to maintain a constant speed and have a constant voltage and frequency output with varying load. The gas consumption is thus proportional to load. But, even at no load, there is a significant gas consumption just to keep the high constant speed required to maintain the frequency and voltage.

    An inverter type generator can lower the speed of the motor under light or no load for higher efficiency since the AC frequency and voltage is now generated electronically by the inverter. It can operate with the varying input voltage from the DC generator as the speed varies.
     
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